The image above shows various human activities that produce pollution. Which
statement below is true?

-They are all nonpoint sources of pollution.
-They are all point sources of pollution.
-Only industrial waste is a point source.
-Only urban runoff is a nonpoint source.

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna